環(huán)境因子對動物生產(chǎn)之影響-文庫吧資料
2025-05-21 22:39本頁面
【正文】 Cow Jersey Cow 24 38 100 100 24 76 96 99 34 46 63 68 34 80 41 56 Relative MP At high T, impact of RH is severe. Total heat loss per unit body mass, in W/kg Adapted from ASHRAE Fundamentals, 1999 400 – 450 kg breeding age (20 months) Holstein Dairy Calf 600 kg Mature Adapted from ASHRAE Fundamentals, 1999 500 kg Cow = 1 kW heater, producing kg water/min 24 oC Adapted from ASHRAE Fundamentals, 1999 QT QS QS At high temperature, latent heat is dominated Heat Output: Qs+QL=QT Adapted from ASHRAE Fundamentals, 1999 At high temperature, heat dissipation is dominated by latent heat QT QT QL QL Adapted from ASHRAE Fundamentals, 1999 % of QL in QT Air temperature, oC QL QT Adapted from ASHRAE Fundamentals, 1999 At least 2 kg of water evaporated from skin for 500 kg Calf per hour 30 oC Adapted from ASHRAE Fundamentals, 1999 At least – kg of water evaporated through respiration for 500 kg Calf per hour 30 oC Adapted from ASHRAE Fundamentals, 1999 Short Summary QT= 1 kW for 500 kg
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